Carbon atoms have four valence electrons are they likely to react with other atoms and why or why not?
a. yes but only with other stable atom
b. no, because they have an even number of valance electrons do they are already stable
c. yes, because they can become more stable by doing so

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

There is a liquid capsule inside a cup full of liquid. the cup full of liquid has salt in it and the liquid capsule has no salt in it. in which direction will the solvent flow? a. the salt does not have to move b. from the capsule to the larger cup c. equally between the capsule and the cup d. from the larger cup to the capsule

As the pea seeds respire, the level of coloured liquid in the left hand part of the capillary tube rises. by referring to what is happening in the apparatus, explain why the level of liquid changes